Answer Posted / shalu verma

MEANING OF M20 AND M200 :-

M IS STANDS FOR "MIX"
AND 20 AND 200 IDICATES THE COMPRESSIVE STRENGHT OF THAT
MIX IN "N/mm2"

LIKE, for M20 C.S IS 20 N/mm2
for M200 C.S IS 200N/mm2

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